Over the years if you have a need of a special plastic or nylon washer for something and you dissassemble, the one washer that always gets lost is the plastic one. Today I was replacing the seat on my motorcycle and guess which washer wasn't there. The plastic one that goes between the rear seat bolt down tab and the fender. I paniced for way to long, and then I grabbed piece of plastic that felt about right and cut one on the mill. I actually spent less time setting up the g-code and cutting the washer than I spent running around paniced looking for a washer first. LOL. Less than ten lines of code, and hardly any time to cut at all.
If you have a tool you will use it.